I use MS Office heavily for my work at the college, which is solely Windows-based so that aspect is not an issue for me.
But I have found the cross-platform capabilities of MS Office to be sorely lacking. The "bar of functionality" varies so much by operating system that this inconsistency caused me quite a bit of irritation. Functions available on one platform don't always exist on another. And I'm not even talking about esoteric "power-user" functions... some of the basics.
Another issue is lack of visual consistency. For example, OneNote's interface is different for every platform it is on. I can't think of where it is the same. In my daily activities (work, home, church) I use devices that run Windows, macOS, iOS, Android, and occasionally ChromeOS. Couple the differences in the UI with the differences in functionality, one wonders, "is it really the same program?" (yes, that is a bit of hyperbole but I can't think of a more subtle way to put it)
Office for iOS is primarily an Office document viewer that allows for minor edits. It does a terrific job of rendering documents, even documents with custom fonts provided that the fonts have been installed on the iPad using something like AnyFont. It can allow basic edits to documents with advanced formatting, but it is not capable of CREATING those advanced documents.
As limited as Office is on iOS, it is even more limited on Android. I much prefer using the web version of MS Office on my chromebook than using the iOS or Android versions.
I understand that there are only a handful of folks who are in a similar situation,
but these are some of the challenges I face in wanting to switch to Android. Given where Apple is going with the iPhone, I know that I'm going to have to switch... and switch soon. I love Android on the phone, but Google has pretty much abandoned it on the tablet. (inclusion of Android app support in ChromeOS is too little, too late, IMO)